Abstract: In the present paper, in-situ preparation of spherical silver nanoparticles(10～30 nm),triangular and hexangular single silver crystal(200～2000 nm) have been conducted in linear chitosan films by photochemical reduction. The spherical silver nanoparticles(5～8 nm) have also been obtained electrochemically in the film. The chitosan/Ag complex has been characterized by means of TEM, SEM, IR spectra and XRD, the preliminary analysis and discussion about the causes of changing of silver crystal structure from multi crystal to single crystal in photochemical reduction process have been carried out.

Key words: Chitosan, Photochemical reduction, Electrochemical reduction, Silver nanoparticles, Silver single crystal